A Joint QR-LS Based Coarse-Fine Channel Estimation and QR-LRL Detection For Mobile Wimax 802.16m
In this paper, the authors extended their previous work of QR-RLS based MIMO(Multiple Input Multiple Output) channel estimation to Mobile WiMAX 802.16m system. Mobile WiMAX system provides high data rate, also fulfills user's requirement like VOD (Video On demand) at very high vehicle speed and also provides better cell coverage area. Channel estimation is crucial part to achieve these goals especially in fast fading environment. Generally, Mobile Wimax systems use preamble and pilots for channel estimation purpose. In the proposed method both preamble and pilots are jointly used for robust channel estimation. At first, QR-RLS Estimator uses preamble for coarse channel estimation at start of every frame.